.backtotop{
    background-color:white;
    border:1px solid black;
    position:fixed;
    bottom:0;
    right:0;
    padding:4px;
}


.tooltip{
    position: relative;
    display: inline;
}

.tooltip .tooltiptext {
    visibility: hidden;
    width: 250px;
    background-color: rgb(255, 255, 255);
    color: #000000;
    border:1px solid black;
    text-align: center;
    padding: 5px;
    border-radius: 6px;
    position: absolute;
    left:5%;
    bottom:0;
    z-index: 1;
    opacity: 0;
    transition: opacity 0.3s;}

.tooltiptext b{
border-bottom: 1px solid black;
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}


.inactive a{
opacity:0.5;
cursor: not-allowed;
}

inactive{
opacity:0.5;
cursor: not-allowed;}